Usher revealed to The Independent that he was "selected" to play Leonard, in what he called a "proper casting".

He also admitted that he is "not at all" intimated to be acting with seasoned actors.

"There's a respect for both parties," he said. "I've seen Oscar winners come out of left field."

Continuing the talk about Oscar winners, Usher referenced former American Idol contestant Jennifer Hudson, who took home the 'Best Supporting Actress' gong for her debut film role in Dreamgirls.

"You asked me, 'Is it okay to assume that an actor who doesn't have as much skill can't out-act an actor who is well-decorated?'" Usher explained. "And what I'm saying is, if you take a moment to just analyse... No.

"I'm not intimidated in any way. Because there's a shared passion and respect among all of us, and it's the type of script that will allow all of us to shine."

Usher added: "I don't know if this is the one that would win me an Oscar or not. I'm going into it offering my interpretation and my hard work and my dedication to be the best Sugar Ray ever. Or as good as the man can be.

"I've spoken to him, and I don't know if I'll ever be able to live up to him. But I'll try to be better than him."